Yr 10 IGCSE Chemistry

3. A Group VII element used to sterilise swimming pool water.
6. A mixture of a metal with other elements, designed to improve its properties.
7. A change of state from liquid to gas at the surface of a liquid.
10. A bond formed when atoms share pairs of electrons.
15. A substance that breaks down into ions when molten or dissolved in water.
18. A reaction in which both oxidation and reduction occur.
19. The electrode connected to the positive terminal during electrolysis.
20. The process in which oxygen is removed from a substance.
23. The breakdown of an ionic compound using electricity.
26. The electrode connected to the negative terminal during electrolysis.
28. The spreading out of particles from an area of high concentration to low concentration.
30. The slow destruction of iron by reaction with oxygen and water.

1. A negatively charged ion.
2. The relative mass of an atom compared with carbon-12.
4. Atoms of the same element with different numbers of neutrons.
5. furnace The extraction of iron from iron ore takes place in this industrial furnace.
8. The smallest particle of an element that still has the properties of that element.
9. A charged particle formed when an atom gains or loses electrons.
11. A mixture of two or more metals, or a metal with another element.
12. A group of unreactive elements found in Group VIII/0 of the Periodic Table.
13. electrons The electrons found in the outer shell of an atom.
14. A substance made from only one type of atom.
16. A reaction that can go in both the forward and reverse directions.
17. The type of bonding found in metals, involving a lattice of positive ions and delocalised electrons.
21. The change of state from gas to liquid.
22. A substance made when two or more elements are chemically bonded together.
24. A positively charged ion.
25. A bond formed by the transfer of electrons from one atom to another.
27. A reaction in which a substance gains oxygen.
29. A Group I metal that reacts vigorously with water and is stored under oil.